A more thorough explanation:

Definition: An environmental impact report (EIR) is a document that provides information about the potential environmental effects of a proposed project. The report identifies and describes the effects, feasible alternatives, and mitigation measures of the project. The purpose of the report is to inform the public and decision makers about the potential issues before the project begins.

For example, if a company wants to build a new factory, they would need to submit an EIR to the local government. The report would identify the potential effects of the factory on the surrounding environment, such as air and water quality, noise pollution, and traffic. The report would also describe any feasible alternatives to the project, such as building the factory in a different location or using different technology to reduce pollution. Finally, the report would suggest mitigation measures to reduce the impact of the project on the environment, such as installing air filters or creating a buffer zone around the factory.

The examples illustrate how an EIR provides information about the potential environmental effects of a proposed project. The report helps decision makers and the public understand the potential impact of the project and consider alternatives and mitigation measures to reduce the impact.